Questions tagged [hvac]
(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.
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12 views
HVAC blower fan won't stop
So I had this problem with my HVAC during winter when out of blue (after working fine for many years) the blower (fan) wouldn't stop, even after the temperature reached the target and the burners shut ...
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1answer
23 views
Need to identify wires coming from external AC Unit
idiot DIY'er here :P. I recently installed a smart thermostat and long story short; I removed the two wires from my furnace's board for the external air conditioning unit in the process. I was going ...
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2answers
26 views
a/c doesn't turn on when temperature is reached
I just changed my thermostat and it does the same thing [as the old thermostat did?].
I get up in a.m. thermostat is set at 77 F. When inside room temp reading on the thermostat reaches 77, a/c doesn'...
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1answer
37 views
Cutting 4" hole on Rim Joist
Would it be advisable to cut a 4" hole on the basement rim joist to install a bathroom fan. The joist size is 8" and is supported by a basement wall.
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1answer
47 views
Remove switch that controls thermostat
I recently bought a condominium in a large building, built in 2005. It has a single thermostat, and the thermostat works fine. But right next to the thermostat, there is a switch. It looks like an ...
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1answer
18 views
a/c condensation line not draining
I have a unit that is installed in the attic and is about 2 years old. For the first year everything was fine and then one day it wouldn’t run. So I hooked up the shopvac and sucked the condensation ...
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0answers
11 views
Ac unit blower cuts on off on off
My blower fan cut on off on off on off that fast then it stays on and runs fine. Only dose it at the beginning of the cycle
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0answers
16 views
Name of A/C hose fitting
I have a set of R134A manifold gauges that I would like to use to pull a vacuum on an R410A system. My hoses terminate at the R134A quick connector with the threading on the right of the attached ...
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1answer
17 views
Old furnace with extra wire, but no c terminal Janitrol, 19 year old furnace
I've searched multiple threads regarding this, but I didn't manage to find any that seemed to match my use case. My board doesnt have a C terminal, and it doesn't have the other terminals connect to ...
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23 views
How do I plug an old duct
While renovating my kitchen, I came across an old exhaust duct in the wall. It goes through the chimney bricks and into the interior of the chimney. The boiler uses a duct within the chimney that is ...
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1answer
40 views
Overflow line tied with Condensate Line
had a house inspection done and the inspector told that Irregular materials were used, I am attaching a pic. how much work is it to repair it? is it a easy fix?
Thank you
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1answer
20 views
Can I safely jumper between either G or Y and RC at thermostat panel to troubleshoot AC problem?
I'm trying to troubleshoot a non-functioning AC. The fan does not come on and there is no cool air/condenser does not run.
My thermostat is a Braeburn. Three things I'd like to try for ...
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0answers
24 views
AC unit not turning on
My A/C doesn't come on when I set the temperature on the Braeburn thermostat very low. Also, the recirculation fan doesn't come on when I set the thermostats fan setting to 'on', as though the indoor ...
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0answers
26 views
Is this where my HVAC air filter goes?
I moved into a home that was poorly taken care of by the homeowner before. It dawned on me today that I've never replaced the HVAC filter (I guess I'm bad at taking care of the house too :) ) in the ...
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1answer
26 views
Furnace with no “C” connection
I have a mobile home furnace. This furnace only has a 4 wire connection terminal, G,W,R,Y. I also have a condensing unit outside with the 24 volt 2 wires coming to the furnace. I know I connect one to ...
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0answers
36 views
Is one large whole house fan better than two smaller ones?
I'm having an addition put on my house and I'm considering the "Quiet Cool" line of whole house fans. The fans are quite expensive and price wise two small fans are almost the same price as one ...
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5answers
59 views
How to size a whole house fan?
I'm in the middle of a home addition and am thinking about adding a whole house fan. The finished size of the house will be about 2000 square feet - approx 1500 on the main level, and 500 on a lower ...
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0answers
18 views
HoneyWell baseboard thermostat
Hello everyone! Need some help here (trying to help a family member) They recently purchased a home that has a furnace and AC ( with central air) in each room there at these honeywell thermostats. ...
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1answer
29 views
Why doesn't my HVAC system use the away temperature setting?
I have a Carrier Infinity dual-fuel 5 stage HP w furnace. I set the away temp much lower than the home temp but the HP keeps running to bring the temp up to the next home temp. I would think the ...
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0answers
14 views
Lennox Furnace Troubleshoot Assist
I have a Lennox Elite G50UH-24A-070-15. It quit entirely and threw the error "Pressure Switch open or blocked" according to the diagnostics panel on the front. Recent renos so thought it was clogged/...
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1answer
29 views
How should I support rectangular duct in wall?
In California, I'm installing a 3x14 rectangular supply duct from my attic to my first floor. It goes vertically through the second floor wall, through the floor, and ends in the first floor ceiling.
...
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0answers
20 views
Draft Inducer Takes a Long Time to Start
When I turn the thermostat up I hear the draft inducer relay click, but the inducer motor doesn't start immediately like it used to. There's quite a lag time before I hear the draft inducer fan start ...
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1answer
24 views
Converting I+ I- thermostat to 'standard' wiring
I've been replacing my thermostats with the RadioThermostat CT50, which reports to my home-brew home control/alarm system. I have a 3-year old AireEase 4-ton unit in the shop that has a Comfort Sync ...
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31 views
AC Goodman unit not powering on
Is getting hot and I tried to power on my AC unit, it only blows warm air and no sound from unit outside, fan is not moving, no noise.
Checked indoor fuses were on and reset them
Checked outdoor fuse ...
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1answer
40 views
convert a onan 110v generator to 220v
My RV has roof-top air conditioning units. The generator will run 2 units. I would like to convert the RV to a mini-split system with 2 air handlers. They require 220V, and draw 25 amps; however my ...
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6answers
4k views
Is Electric Central Heating worth it if using Solar Panels?
I understand that electric heating is less efficient and comparatively more expensive than gas heating (propane or natural gas), but considering I live in Texas (a lot of sunlight) and I intend to ...
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1answer
14 views
Furnace burners shut off an hour after running?
Older furance that wasnt holding pressure. Leak was found and gas valve replaced. Gas is on. Fired it up yesterday for the 1st time. The house has been vacant awhile. We had no problem. Came ...
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2answers
35 views
A/C blower does not work after a power surge
My outside unit works but my inside unit does nit turn on, its a bryant a/c system. On the unit it says the circuit board is built into the blower motor. The transformer buzzes. Can I replace the ...
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0answers
16 views
Furnace limit switch only reading 12 volts, I have 24 volts coming out of transformer
12 volts at primary limit switch, 24 volts out at transformer 24 volts at c & w terminals when stat calling for heat. furnace will not light, trouble codes call for bad primary/secondary limit ...
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1answer
29 views
C Wire in Air Handler
Can someone please help me find where to connect a C wire for my smart thermostat? Here are some pictures with descriptions. It is difficult to get to the 24v connection in the back. My schematic ...
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0answers
21 views
Circulating main floor AC to above and below floors
In the summer the main floor with the AC is always comfortable, the basement is a bit warmer and the 2nd floor unbearably hot.
I'll be adding more insulation under the roof to help, but short of ...
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1answer
129 views
What is this mysterious filter and purpose?
Behind the regular HVAC air filter and next to the duct, there is a filter area with some rough filter covering an additional smaller duct. Does anyone have any idea what it is and its purpose?
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1answer
38 views
Insulating built-in air conditioners
My apartment has Frigidaire built-in air conditioner holders. I did not buy a Frigidaire AC unit because the size needed to perfectly fit the holder was unnecessarily large (and expensive). I have a ...
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0answers
15 views
HVAC: attic heat loss
Should a ventilated attic (w. Openings in the eaves) be warm in the middle of a cold winter that has a heat pump installed as the heating system for the living area below. If it is warm does that mean ...
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2answers
29 views
4 ton air handler with 3.5 ton air conditioner
What effect will having a 3.5 ton air conditioner used with a 4 ton air handler have on the energy efficiency of the hvac system?
Right now we seem to be using a lot of energy per month. The question ...
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0answers
19 views
Air return proximity to furnance
We are refinishing our basement that wasn't original conditioned. New supplies and zoning were added by a contractor. We want to add an air return in the living space by tapping into the main return ...
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0answers
13 views
Name of my central heat pump unit
This sounds crazy but i cant find out what brand central package unit i have. Ive looked everywhere on the internet.. I believe its a york , because there is a address on the bottom of this tag saìys ...
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1answer
21 views
Upgated pump for 10 zones, 3 floor house?
I currently have a tanco (I don't have the current model # now) in a 5 zone 2 story house. I was recommended to upgrade to a tanco 0010-F3-1IFC bc I am adding 5 more zones, and 2 zones will go up to ...
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1answer
24 views
A.c. fan outside not coming on
It started with the thermostat not going in on only fan. That night i go to turn the AC on and the condenser fan wouldn't come on so I took a stick moved the blades and it started . i thought its the ...
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2answers
35 views
HVAC fan on compressor not coming on
I noticed today that the button on the thermostat isn't turning the fan on by itself. I tried today just to turn on the fan couldn't get it turn on.
Tonight we turn on the AC couldn't get cold air. ...
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1answer
9 views
Heat pump filter
I have a trane heat pump in my attic, do I replace the filter in the air handler AND return grill? Not sure if I can use just the return grill which is in my hallway ceiling
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1answer
29 views
How should I size an air conditioner for a room in the attic?
My bedroom is upstairs in the attic and much of the interior walls/ceiling are the underside of the roof.
I believe there is a couple inches of hard foam between the drywall and the sheathing/roofing....
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2answers
31 views
What is the difference between the filter on my furnace and an Air Exchanger?
I live in the Pacific Northwest (Seattle area) and the allergy season has started for me. It is so bad that I am thinking about getting an air exchanger for next year. The house I live in was built in ...
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2answers
36 views
HVAC Heat Supply - Register type (Square Register or Round Diffuser?)
We are adding new heat supply runs to our basement ceiling. We have had 3 HVAC contractors look at it and all 3 want to use 5" round air diffusers instead of the normal metal square registers.
Here ...
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1answer
28 views
New Cold air return at the end of duct?
I've readarguments against putting a new heat branch at the end of a duct because it essentially lets all the pressure out the end, but does the same theory apply to a cold air return?
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3answers
47 views
Furnance Drain Line Not Draining
Recently had a new furnace/ac/ductwork installed in our home. The furnace/air handler are located in the attic on the second floor of the home. A drain line is run from the unit to the utility room on ...
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0answers
14 views
Does an open circuit on the high limit switch trip the reset
My American Standard Freedom 90 furnace works all day and all night until morning. I set the temp back at night. It starts up in the morning then kicks out and only blower runs. I push the reset and ...
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1answer
25 views
Garage Vent Intake/Exhast
So I have a 1.5 car garage that seems to be sealed off, airflow wise pretty well. Any moisture from rain or snow just seems to sit and not evaporate at all or extremely slowly. Also, I dry out my ...
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1answer
19 views
Use CLR to clean stuck bleeder valve
I was bleeding the air out of hydronic heating zones and I notice some mineralization on bleed valve attached to my air scoop. I took the Schrader valve cap off and tapped the valve I noticed it was ...
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2answers
41 views
Why is the defrost cycle of an HVAC so loud?
During the colder months when defrost mode switches on it can run for roughly ten minutes to thaw out the unit. I understand that. My question is why is it so loud? Why does it have to make such a ...
